Quarterly report pursuant to Section 13 or 15(d)

D. ACCOUNTS RECEIVABLE (Details)

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D. ACCOUNTS RECEIVABLE (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Components of accounts receivable    
Accounts receivable $ 949,935us-gaap_AccountsReceivableGrossCurrent $ 1,497,295us-gaap_AccountsReceivableGrossCurrent
Allowance for doubtful accounts (32,217)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (36,873)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts receivable, net $ 917,718us-gaap_AccountsReceivableNetCurrent $ 1,460,422us-gaap_AccountsReceivableNetCurrent